OLED Reflective Member Openings for Contrast
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Solution Overview
Problem
Organic light emitting display (OLED) devices face reduced visibility of images in high illumination environments due to high reflectivity of reflective members, which decreases image contrast.
Innovation Solution
Incorporating a reflective member with controlled reflectivity by defining specific openings, such as triangular, square, or elliptical second openings, to reduce external light reflection and increase image contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a reflective member with high reflectivity is used, then the device can be made thinner and luminance is improved, but visibility in high illumination environments deteriorates due to decreased image contrast
Solution Approach 1:
The reflective member is designed with non-uniform reflectivity across different regions. The first region has a first reflectivity while the second region has a second reflectivity different from the first. This local variation in optical properties allows different parts of the display to optimize for different viewing conditions, maintaining high luminance where needed while controlling reflections that harm visibility in bright environments.
Solution Approach 2:
The reflective member is divided into multiple distinct regions (first region and second region) with different reflectivity characteristics. This segmentation allows independent optimization of each region's optical properties, enabling the display to achieve both high luminance and improved visibility in high illumination environments by directing reflected light away from the viewer's line of sight in certain areas.
2Illumination intensity
If the reflective member area is increased to improve luminance, then brightness is enhanced, but reflectivity in high illumination environments increases causing reduced image contrast
Solution Approach 1:
Different regions of the reflective member have different reflectivity values. The first region provides high reflectivity to enhance luminance and brightness, while the second region has adjusted reflectivity to control harmful reflections in high illumination environments. This spatial variation in optical properties resolves the contradiction between needing high brightness and avoiding excessive reflectivity.
Solution Approach 2:
The reflectivity parameter of the reflective member is changed across different regions. By varying the reflectivity from the first value in the first region to the second value in the second region, the system optimizes both luminance enhancement and reflection control, allowing the display to perform well in both bright and high illumination environments.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The controlled reflectivity of the reflective member enhances image visibility in both bright and low-light environments by adjusting the size and shape of openings based on the usage setting, thereby improving image contrast and visibility.
Implementation Method 1
a reflective member which defines an opening to control a reflectivity of the reflective member
Data Source
AI summary
An organic light display device includes a first substrate, light emitting structures, a second substrate and a reflective member. The first substrate includes a plurality of pixel regions, each pixel region including a plurality of sub-pixel regions, and a reflective region which surrounds the sub-pixel regions. The reflective region excludes the sub-pixel regions. The light emitting structures are respectively disposed in the sub-pixel regions on the first substrate. The second substrate is opposite to the first substrate. The reflective member is disposed in the reflective region on the lower surface of the second substrate. First openings exposing the sub-pixel regions and a second opening exposing at least a portion the reflective region are located in the reflective member.